The present paper develops an improved computational method
that is necessary to calculate and understand the avoided
crossings in Cs\(_2\) . This method uses a propagator approach
[1]} in place of a radial basis set to
represent the molecular bound states. It can readily be adapted
to threshold states of other
molecules [2]}, [3]}. The propagator approach
is computationally much cheaper than the DVR approach and as a
result can include many more coupled spin channels. The new
approach is used to compare the calculated and observed
properties of the avoided crossings, in order to identify
aspects of the ground-state coupled-channel model for Cs\(_2\) 
that are still in need of improvement.
